Mold



Feb. 19 1924.

J. S. THOMPSON MOLD Filed Nov. 20, 1925 z3 fai fa Y? Wwf@ Patented heb. 119, i924.

JAMES S. THOMPSON, OF PELHAM, NEW YORK.

MOLD.

To all whom t may concern:

Be it known that l, J AMES S. THOMPSON,

a citizen of the United States, residing at Pelham, in the county of Westchester and State of New York, have invented certain new and useful improvements in Molds, of

which the following is a specification.

More particularly this invention relates to metal molds for making brake shoes, and l0 other castings, and its object is broadly to prolong the life and to facilitate the repair of those permanent molds having refractory sections forming the walls or parts of the walls of the mold cavities.

ln actual` practice, the corners and edges of the refractory sections of these molds chip and spallv when left unprotected and the molds yield imperfect castings, the refractory sections often sustaining further damage when the imperfect castings are removed from the molds. Material damage to a refractory section necessitates replacement thereof and when a wall of a mold cavity is formed mainly of an integral refractory section, the task of replacing the section involves considerable labor and is comparatively expensive.

Y A more specific object of this invention is to overcome these difculties by constructing those walls of the mold cavities having refractory sections therein, in such a manner as will negative to a large extent the tendency of the sections to chip and spall, and at the same time will permit repair, at a relatively low cost and with a minimum of labor, of a mold having a damaged refractory section.

While it will become apparent as this description progresses that my invention can be embodied in molds for making various types of brake shoes, and for making castings for other purposes,`I have selected a brake shoe mold for disclosing the invention, the selected embodiment of my invention being illustrated in the accompanying drawings, wherein- Fig. 1 is a longitudinal sectional view of a mold for casting brake shoes and em* bodying my invention.

Fig. 2 is a section taken on line 2-2 of Fig. 1.

Fig. 3 is a plan elevation of the drag of the mold shown in Fig. 1, and

Fig. 4 is a fragmentary longitudinal section through a mold for casting brake shoes of another type and this mold also embodies my invention.

Referring to Figs. 1, 2 and 3 of the drawings, l have illustrated a metal mold for cast ing a brake shoe having an integral composite wearing face. The mold comprises a cope member 10 and a drag member 11 having a pouring gate 12 through which molten metal may be poured into the mold cavity 1 3. lnterengaging shoulders lei-l5 are provided on the mold members to properly align one member with relation to the other and to hold them in aligned position during the casting operation. The pouring gate is located at the right end of the mold and interengaging shoulders are located on the opposing faces of the mold members at the opposite end and at the sides of the mold.

My invention is adapted for use where the mold cavity walls are part refractory and part metal as shown in Figs. 1, 2 and 3 and also Where the mold cavity walls are substantially all refractory, as indicated in Fig. 4. In Fig. 1, the walls of the mold cavity, at the ends 16 thereof, are left bare to chill the ends of the casting. A plurality of refractory sections 17, 17n and 17b in the drag and a plurality of refractory sections 18, 18 18b and 18 in the cope provide Wall surfaces which will not chill the casting. A reinforcing back 19 and a steel lug 20 for a brake shoe, together with a lug core 2l, are held by wires 22, and a crossbar 23, in'proper position in the mold cavity and in the sand plug 24. As shown in Figs. 1, 2 and 3, the cope forms the top, one side and one end of the mold cavity and the drag forms the bottom, one side and one end of the mold cavity; the parting line eX- tends down through the pouring gate to the top of the mold at one end of the mold cavity and one side thereof, and down the other end of the mold cavity to the bottom thereof and along the other side of the mold cavity at the bottom thereof.

lt Will be noted that each of the refractory sections in the drag and cope has a face forming part of a mold cavity wall and that the remaining faces of each refractory section are embedded in the metal of the mold. It will also be noted that the refractory sections 17" and 18c are spaced from the parting line between the drag and the cope by means of ribs 25 which are preferably formed integral with the metal of the mold. Ribs 25 are also provided for protecting the left hand sections 17a (Fig. 2). As best shown in Fig. 3, the refractory sections 17, 17a and 17b of the drag 11 are disposed in recesses or openings between a plurality of ribs 26 which, in this instance, are arranged transversely of the mold cavity. The ribs 26 are intersected by a plurality of ribs 27 extending longitudinally of the mold cavity. 'As shown in Figs. 1 and 2, the refractory sec- 'tions of the drag have their exposed faces substantially flush with the inner edges of the ribs 25, 26, and 27. I find it convenient to form the ribs 25, 26 and 27 integral with the metal of the mold and also to place the refractory material in the mold when it is vin a plastic or semi-plastic condition, the refractory material being dried before the mold is employed in a casting operation. l have `found in practice that this is a very satisfactory way of providing a mold with refractory sections.

Referring now to Figs. 1 and 2, the refractory sections 18, 18a, 18T and 18c are disposed in recesses or openings between a plurality of spaced ribs 28 extending longitudinally of the mold cavity 13. The refractory sections 18 and 18a are further protected by ribs 29 extending transversely of the mold cavity. A plurality of ribs 3() are also provided for spacing the refractory sections 1Sa and 18b from the opening occupied by the sand plug 24 and the outer ends of the refractory sections 18 and 18c are protected and supported by ribs 31 which conform'to the configuration of the end lugs of the shoe.

Itis apparent that substantially all of cach wall of the mold cavity, with the exception of the end walls, is formed of refractory material and that each refractory section is so embedded in the metal of the mold that only a single face thereof is exposed, the exposed face forming part of a wall surface in the cavity. The ribs which form the recesses or openings for the refractory sections are preferably tapered to a comparatively narrow or thin edge whore they are exposed in the mold cavity and l have found in practice that such a restricted area of metal in the wall of the mold cavity and in association with the refractory sections will not produce an appreciable chilling of the casting or to any material extent affect the saine. The ribs form a protection for the refractory sections, and for the edges and corners thereof, and prevent chipping, spalling and other damage, which I have found in practice will occur sooner or later to a greater or less degree unless the sections are protected. For all practical purposes, the plurality of refractory sections forming a part of one of i ,estese is of substantially uniform texture throughout its body. ln this mold the end walls of the mold cavity 13l (only one end wall being shown) are provided with a plurality of refractory sections 32 and 32ZL which are spaced from each other by a rib 33. The mold shown in Fig. et resembles the mold shownin Figs. 1, 2 and 3 in all other respects.

l am aware that changes in the form, construction and arrangement of parts may be made without departing from the spirit and without sacrificing the advantages of the invention and l consider myself entitled to make all such changes as fairly fall within the scope of the following claims:

I claim: v

1. A mold for making brakel shoes and other castings, and embodying a metal drag and a metal cope having a mold cavity therein, said mold cavity having a wall for forming an unchilled portion of the shoe or other casting and comprising a plurality of refractory sections having faces exposed in the mold cavity, and an inwardly projecting rib for protecting a face of each of two adjacent refractory sections, said protected facesV of said sections forming edges with said faces thereof exposed in the mold cavity.

2. A mold for making brake shoes and other castings, and embodying a metal drag and a metal cope having a mold cavity therein, said mold cavityhaving a wall comprising a plurality of ribs, and refractory sections disposed in the openings between the ribs, the inner faces of the refractory sections being disposed substantially flush with the inner edges of the ribs.

3. A mold for making brake shoes and other castings, and embodying a metal drag and a metal cope having a mold cavity therein, said mold cavity having a wall comprising a plurality of spaced ribs, another rib formed integral with and intersecting said spaced ribs, and a plurality of refractory sections disposed in the openings between the spaced ribs on each side of said intersecting rib, the inner faces of the refractory sections being disposed substantially flush with the inner edges of the ribs.

4. A mold for making bralre shoes and other castings, and embodying a metal drag member and a metal cope member having 'a mold cavity formed therein, one of said members having a plurality yof walls of the mold cavity formed thereon, each of said walls comprising a pluralityy of refractory sections spaced from the parting line and having Mein-ree faces exposed in the mold cavity, the remaining faces of each refractory section being einbedded in the metal of the mold.

5. A mold for making brake shoes and other castings, and comprising a drag and a cope and having a mold cavity therein, a plurality of refractory sections set in the walls of the mold cavity, and crossed metal ribs between said sections and having their inner edges flush with the inner faces of said sections to form a composite Wall surface for the mold cavity.

6. A mold for making brake shoes and other castings, and comprising a inetai drag and a metal cope and having a mold cavity therein, said drag and cope being recessed and provided with ribs having their inner edges projecting to the Wall surface of the mold cavity, soine of said ribs being ar ranged to abut at the parting line between the drag and cope, and refractory sections seated snugly in the recesses between said ribs and forming therewith composite Wall surfaces for the mold cavity.

JAMES s. rnc-Meson. 

